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  1. General 6.7 Discussion (2011-2016)
    I'm just wondering about some extra transmission gearing. As my signature says I have 3.55 gears and 275/70r18(33.2) tires. So I just recently got the Spartan custom transmission tuning because my truck was shifting hard and now I have noticed that sometimes my truck says I'm in 6th gear yet the...
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